Bicycle-seat.



mi; 690,734. 1 'Patented-'Jam 7, '|902'.

H. JABvls.

BlcYcLE SEAT.' (Appumon ma Aug. 19,1901.)

v2 sheets-sheet 2".

(No Model.)

1 in propelling the machine.

UNITEDA STATES PATi-:NT OFFICE.

. HAROLD JARVIS, OF BUFFALO, NEW YORI'I, ASSIGNOROF ONE-HALF TO RICHARD H. TIIOMPSONyOF BUFFALO, NEW YORK.

'BICYC LE-S'EAT.

SPECIFICATION forming part of Letters Patent No. 690,734, dated January 7, 1902. Y 'I Application filed August 19, 1901. Serial No. 72,462. (No model.)

To a/ZZ whom it may concern:

Be it knownthat I, HAROLD JARvIs, a citizen of the United States, residing at Budalo, in the county of -Erie and State of New York, have invented new and useful Improvements in Bicycle-Seats, of which'the following is a' Y and D2 D3 the upper and lowerreach memspecification. y

This invention relates to a seat and attachments for the same, designed more 'particularly foi use on a bicycle in which the seat is comparatively low and lprovided with a back-rest and in which the cranks are 1ocated somedistance in advance of the seat, the rider applying pressure to the pedals in a forward and downward direction and thrusting his back against the Iback-rest of the seat A bicycle of this character is described and shown in another application for patentfiled by me on or about the 17thvday of June, 1901,-Serial No. 64,777. Owing to the powerful thrust exerted against the back-rest of the seat, the same must bev very strong; and it` is one of the objects of my present invention to produce a seat which possesses the necessary strength and has its back-rest effectually braced and `which is at the same time light and durable in construction.

Another object oftheinvention is to render the seat adjustable toward and from the cranks in a convenient manner to suit riders of different statures.

In the accompanying drawings, consisting of two sheets, Figure l is a side elevation of a bicycle provided with my improved seat. Fig. 2 is a top plan view thereof. Fig. 3 is a sectional elevation of the seat and adjacent members of the bicycle-frame on an enlarged scale. Fig. et is a transverse vertical section in line 4 4, Fig. 3. Fig. 5 is a similar section in line 5 5, Fig. 3. Fig. 6 is a horizontal section in line 6 6,*Fig. 3, looking upward. Fig. 7 is a horizontal section in line 7 7, Fig. 3. Fig. 8 is a fragmentary sectionall elevation of the seat andthe bicycle-frame, showing a modified constructionof the seat-brace. Fig. 9 is a fragmentary side elevation of another modified construction.

Like letters of reference refer to like parts' in the several figures.

A is the steering-wheel and the drivingwheel.

C, C', and C2 are the members which constitute the raised triangular rear part of the bicycle-frame.

D is the steering-head, Dl the front fork,

rotary stem lof 'theV front fork by sprocket- Wheels c e2 and ach-ain e3, and f is the crankshaft, mounted on the depressed front part of the frame below the steering-post.

' F is a T-shaped seat-post arranged above the depressed portion of the frame immediately in front of the upright member C of its raised rear part and telescoping into an upright supporting-tube F', secured to the upper and lower reach members D D2. y

My improved seat, which is mounted on the T-post F, is composed of the seat proper, G, a back-rest G, and a frame-G2, to which said parts are attached. The frame G2 comprises a pair of horizontal rods g, arranged lengthwise of the frame on -opposite sides of the horizontal arm or head of the T-post F, and a pair of nearly-upright rods g', extendingupwardly from the rear ends of the longitudinal rods g and connected at their upper ends by a cross-bar g2, this bar and the several rods beingfpreferably lbent from a single rod of 'spring-steel. As shown in Figs. 1 and 6, the seat G is secured to the longitudinal frame-rods g `by clips g3 or other suitable fastenings. These rods pass through eyes h, arranged at the ends of a pair of crossbars I-I, and are secured therein by set-screws h' or other suitable means. lThe'cross-bars H are adjustably mounted on the horizontal head or member of the T-post F and for this purpose are provided centrally with eyes h2, which embrace said post member and carry clamping or set screws h3, which bearagainst the same, as seen in Figs. 1, 3, and 6.

The back-rest G' of the seat preferably comprises two similar parts or sections, as shown, which sections extend across the front side ICO of the upright rods g and are curved to conform to the riders back. They are preferably separated to leave a space i for receiving the portion of the riders back where the protuberant parts, such as the rear trouserbuitons and the crossed parts of the suspenders, are located, thus relieving the rider from ihe pressure of these parts. For a similar purpose the sections of the back are provided centrally in their front sides with vertical grooves or depressions i', which receive the backbone.

The back-rest sections are made vertically adjustable on the upright rodsg by attachments of any suitable construction. The preferred attachments (shown in the drawings) consist of transverse rods y', supported at their ends in horizontal sleeves or bearings j and provided on their rear sides with upright eyes 1.o L72, which encircle the upright rods g of the seat-frame, as most clearly shown in Figs. 3, 1t, and 7. The eyes D7'2 are adjustably clamped to the rods g' by set-screws, as shown, or other suitable means. The back-rest sections are attached to the transverse rods j by clipsj, having horizontal eyes which' encircle said rods. These clips may be loosely swiveled on the rodsj to allow the back-rest sections to accommodate themselves to the riders back, or the clips may be clamped to said rods by set-screws, as shown.

The seat-post F is preferably vertically movable in the supporting-tube F and suitably cushioned by a spring 7c, Fig. 3. The post is provided with ball-bearings 7c' of any approved construction to minimize friction, and its upward movement is limited by the upper bearing-collar k2 of the post and a cap 7a2, applied to the upper end of the supporting-tube F.

In order to brace and stiffen the back-rest of the seat, the same is provided at or near its upper end with a rearwardly-extending brace, connection, or attachment, which is adapted to engage or abut against the adjacent upright member C of the raised rear part of the bicycle-frame or be secured thereto. Then a cushioned seat-post is employed, as shown in Figs. l to 7this rear bracing is preferably applied also to the seat and effected by applying a lower antifriction or guide roller Z to the seat-post and an upper antifriction-roller Z' to the back-rest, which rollers run against a grooved upright track m, arranged on the front side of the elevated frame member C, as shown in Figs. 1, 3, 6, and '7. The lower rollerZ is journaled at the rear end of the seat-post, while the upper roller Z is journaled in a yoke or bracket N,

the arms of which extend rearwardly on opposite sides of the elevated frame member C and the bow n of which is attached to a cross-bar 0, which bridges the upright members g of the seat-frame, as shown in Figs. 4 and '7. This cross-bar is preferably divided centrally into two sections, cach of which is provided at its outer end with a vertical eye 0', which embraces the adjacent rod t", and at its inner end with a horizontal or transverse eye o2, which receives the bow of the yoke N. The sectional cross-bar o is adj ustably clamped to the rods g by set-screws, and the bow of the yoke N is similarly clamped in the eyes of said cross-bar by set-screws, as seen in Fig. 7. Thisyoke is preferably bent from a single piece of heavy steel wire, and the purpose of making the cross-bar o in two sections is to permit its transverse eyes to be passed over the arms of the yoke and around the bends thereof in assembling the parts. The upper guide-roller Z may be journaled in the yoke N in any suitable manner. In the construction shown in the drawings, Fig. 7, its journals are seated in bearings p, which are adj ustable on the yoke-arms toward and from the elevated frame member C and clamped in position by set-screws. By this improved construction a rigid rear abutment is pro vided for the back-rest of the seat which effectually withstands the powerful thrust exerted against the back-rest by the rider, especially in propelling the bicycle up a hill, and the seat is at the same time free to vibrate vertically with its cushioned seat-post.

The seat can be adjusted forwardly or backwardly, as may be required by the length of the riders limbs,by simply loosening the setscrews of the seat-carrying cross bars H, shifting these bars on the seat-post as required, and again tightening the setscrews. This adjustment of the seat requires a corresponding adjustment of the upper thrustroller Z', and to eifect this adjustment the set-screws of the bearings p are loosened, the bearings slid to the proper position to bring the roller in contact with the track m, and the set-screws again tightened.

By making the seat-frame of a continuous piece of comparatively heavy steel Wire its construction is light, simple,and inexpensive.

While preferring t-he construction of the back-rest brace hereinbefore described, I do not wish to limit myself to any particular construction of the same, as it may be modified in various ways without departing from my invention. For example, as shown in Fig. 8, the brace may consist of a rod n', attached at its front end to the upright member G2 of the seat-frame and at its rear end to the projecting upper end of a ball-bearing stem Z2, capable of sliding up and down in the elevated upright member C of the bicycleframe for following the corresponding movements of the cushioned seat-post. modification the rear portion of the brace is longitudinally adjustable in a socket Z3 at the upper end of the stem Z2, in which socket it is clamped by a set-screw.

Fig. 9 shows another modification in which the stem f of the seat-post F is rigidly secured to the seattube F'. The rear end of its head f' is secured to the frame member C IOO IOS

IZO

In this by a clamp f2, and the stem Z4, carried by the frame member C,is rigidly secured to said.

. member, a seat having a back-rest and supported upon said reach member immediately in front of the projecting upper portion of said rear-wheel frame, and a brace or connection extending rearwardly from the back-rest of the seat to the adjacent raised portion of said rear-wheel frame, substantially as set forth.

2. In a bicycle-seat the combination of a seat-post having a horizontal member, a seat proper capable of forward and backward adjustment on the horizontal member of the seat-post, a back-rest attached to the seat, and an adjustable brace extending rearwardly from the back-restand constructed to engagek with a member of a bicycle-frame located in rear ofthe back-rest, substantially as set forth.

3. The combination of a bicycle-frame, a vertically-movable seat havin ga back-rest, a brace extending rearwardlyfrom the backrest, and a guide-roller carried by said brace and arranged to bear against an upright member of the bicycle-frame located in rear of the back-rest, substantially as set forth.

4. In a bicycle-seat, the combination of a vertically-movable seat-post having a horizontal member provided at its rear end with a guide-roller, a seat proper mounted on said seat-post and having a back-rest, and a brace attached at its front end to the back-rest and provided at its rear end with a guide-roller, said guide rollers being arranged to run against a member of the bicycle-frame located in rear of the back-rest, substantially as set forth.

5. The combination of a bicycle-frame having its rear portion raised above its front por-` tion, a vertically-movable seat-post mountedv on the depressed portion of the frame immediately in front of the raised portion thereof and having. a head provided at its rear end with a roller which runs against the adjacent raised portion of the bicycle-frame, and a seat mounted on said head, substantially as set forth. Y

6. A vertically-movable bicycle-seat having a back-rest, a brace-yoke extending rearwardly from said rest, and a guide-roller journaled between the arms of the yoke and adapted to run against the bicycle-frame, substantially as set forth.

7. A bicycle-seat having a frame provided with upright members, a back-rest attachedV to said members, a cross-bar composedof sections attached at theirouter endsto said upright members and provided at theirinner in the'eyes of said cross-bar, and a guideroller journaled between the arms of said yoke, substantially as set forth. Y

8.- In a bicycle-seat, the combination ofv a frame composed-of a pair of horizontal bars arranged side by side and a pair ofv connected upright bars extending upwardly. from thev rear ends of said horizontal bars, a pairof separated transverse bars connecting said horizontal bars and provided centrally with eyes adapted to receive the head of a seat.- post, a seat provided on its under side with clips which are attached to said horizontal frame-bars between said transverse bars, and a back-rest attachedl to said upright framebars, substantially as set forth.

9. A bicycle-seat having a back-restprovided centrally in its front side with a vertical groove, and having the portions thereof on oppositesides of the groove rounded to conform closely to the riders back, forming a broad abutment which, when the seat is loccupied, is in contact with the riders back throughout its width, substantially as set HAROLD JARVIS.

Witnesses:

THEO. L. PoPP, CARL F. 1GrEYma.

, ends with horizontal eyes,a brace-yoke formed I in a single piece and having its bow arranged 

